<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意: 只允许为第三级分类设置相关参数!"
                type="warning"
                :closable="false">
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys"
                       :options="cateList"
                       :props="cateProps"
                       @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName"
               @tab-click="handleTabClick">
        <el-tab-pane label="动态参数"
                     name="many">
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible=true">添加参数</el-button>
          <el-table :data="manyTableData"
                    border
                    stripe>
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <el-table-column type="index"
                             label="#"></el-table-column>
            <el-table-column label="参数名称"
                             prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性"
                     name="only">
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible=true">添加属性</el-button>
          <el-table :data="onlyTableData"
                    border
                    stripe>
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <el-table-column type="index"
                             label="#"></el-table-column>
            <el-table-column label="属性名称"
                             prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加对话框 -->
    <el-dialog :title="'添加'+titleText"
               :visible.sync="addDialogVisible"
               width="50%"
               @close="addDialogClosed">
      <el-form :model="addForm"
               :rules="formRules"
               ref="addFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改对话框 -->
    <el-dialog :title="'修改'+titleText"
               :visible.sync="editDialogVisible"
               width="50%"
               @close="editDialogClosed">
      <el-form :model="editForm"
               :rules="formRules"
               ref="editFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { getCateData } from '../../network/goods';
import { getCateList, addCateParams, queryParams, editSubmitParams, deleteParams, submitParams } from '../../network/cateParams';
export default {
  name: 'GoodsParams',
  data () {
    return {
      //商品分类列表
      cateList: [],
      //指定级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定的数组
      selectedCateKeys: [],
      //被激活的页签名称
      activeName: 'many',
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      editForm: {

      },
      formRules: {
        attr_name: [
          { required: true, message: '请输入内容', trigger: 'blur' },
        ]
      },
    }
  },
  created () {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList () {
      const res = await getCateData();
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败');
      }
      this.cateList = res.data;
      //console.log(this.cateList);
    },

    //级联选择框选中变化，会触发这个函数
    handleChange () {
      this.getParamsData();
    },

    //tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData();
    },

    //获取参数的列表数据
    async getParamsData () {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = []
        return;
      }

      const res = await getCateList(this.threeCateId, this.activeName);
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败');
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
        this.$set(item, 'inputVisible', false);
        this.$set(item, 'inputValue', '');
      });

      if (this.activeName === 'many') {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }

      //console.log(res.data);

    },

    addDialogClosed () {
      this.$refs.addFormRef.resetFields();
    },

    //点击确定按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const res = await addCateParams(this.threeCateId, this.addForm.attr_name, this.activeName);
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败');
        }
        this.$message.success('添加参数成功');
        this.addDialogVisible = false;
        this.getParamsData();
      })

    },

    async showEditDialog (attr_id) {
      const res = await queryParams(this.threeCateId, attr_id, this.activeName);
      this.editForm = res.data;
      this.editDialogVisible = true;
    },

    editDialogClosed () {
      this.$refs.editFormRef.resetFields();
    },

    async editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const res = await editSubmitParams(this.threeCateId, this.editForm);
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败');
        }
        this.$message.success('修改参数成功');
        this.getParamsData();
        this.editDialogVisible = false;
      })
    },

    async removeParams (attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除');
      }
      const res = await deleteParams(this.threeCateId, attr_id);
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败');
      }
      this.$message.success('删除参数成功');
      this.getParamsData();
    },

    async saveAttrVals (row) {
      const res = await submitParams(this.threeCateId, row);
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败');
      }
      this.$message.success('修改参数项成功');
    },

    //输入框确认
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return;
      }
      row.attr_vals.push(row.inputValue);
      row.inputValue = '';
      row.inputVisible = false;
      this.saveAttrVals(row);
    },

    showInput (row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },

    handleClose (i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }

  },
  computed: {
    //按钮禁用与否
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类id
    threeCateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //对话框的标题
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数';
      }
      return '静态属性';
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-table {
  margin-top: 15px;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 100px;
}
</style>